Scottish Water has officially announced it is to build a 5km long, 4.65m diameter waste water tunnel in the south of Glasgow as part of the biggest upgrade of the city’s waste water network in more than a century. Work on the $160M, TBM driven Shieldhall Tunnel is expected to start in mid-2014 and take three and a half years to complete.
The tunnel will be a major part of Scottish Water’s US$400M, five-year programme of work announced in February to upgrade the waste water network in the Glasgow area. It will be the biggest storm water storage tunnel in Scotland and will resolve water quality and reduce flooding issues at key locations in the area served by the Shieldhall Waste Water Treatment Works (WWTW).
The biggest investment in the network since Victorian times, the upgrade will improve river water quality and the natural environment of the River Clyde and its tributaries, enable the Greater Glasgow area to grow and develop, alleviate sewer flooding and deal with the effects of increased rainfall and climate change.
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Mr Geoff Aitkenhead, Scottish Water’s Asset Management Director, said: “Following the launch in February of our five-year programme of investment to transform the Greater Glasgow area’s waste water infrastructure, we are delighted to be able to confirm this key part of the programme.
“The Shieldhall tunnel will resolve large-scale water quality problems in the River Clyde and its tributaries. The tunnel will increase capacity and alleviate pressure on the existing network by providing additional storm water storage.”
Welcoming Scottish Water’s announcement, Deputy First Minister Nicola Sturgeon, Cabinet Secretary for Infrastructure, Investment and Cities, said: “The improvement of Glasgow’s sewerage network is essential to its future economic growth, a cleaner environment and to resolve long-standing flooding issues.
“In February 2013, we announced a US$400M package of investment that will transform an ageing network into a modern and sustainable drainage network fit for the needs of 21st century Glasgow. The Shieldhall tunnel is an essential part of this project.”
The new waste water tunnel will transfer combined sewer flows (surface water such as rainfall and waste water from properties) and provide storm storage (of heavy rainfall).
The tunnel will head northwards under Pollok Park and beneath the M77 and then beneath Bellahouston Park, terminating at Craigton industrial estate where it will join the existing network and where waste water will flow onwards to Shieldhall WWTW.
Scottish Water’s investment in the tunnel, and the overall environmental improvement scheme, follows years of collaboration and studies by the Metropolitan Glasgow Strategic Drainage Partnership (MGSDP), which includes Scottish Water, the Scottish Environment Protection Agency (SEPA) and local authorities such as Glasgow City Council.
The tunnel route was carefully selected to minimise disruption across the city.